JPH11108407A - Air shower apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air shower apparatus which prevents infiltration of polluted outside air by a circulated air current formed as laminar flow by supplying two flows of air with one common fan in an air shower apparatus for generating the circulated air current and a jet air flow. SOLUTION: An air shower apparatus generates a circulated air current which is blown out through a filter 53 from a ceiling blowoff port of a shower chamber 19 and a jet air flow which is blown out through a filter 49 from a blowoff port of the side wall of the shower chamber. In this case, a common fan 33 is provided to generate both the air flows, a duct 37 to supply an air flow to the common fan 33 from a lower takeoff port of the shower chamber, a duct 47 from a blowoff port of the common fan 33 and an air volume adjusting damper 43 in the course of the duct 53 toward the ceiling bypassing the filter 49.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air shower device used at an entrance of a clean room or the like.
In particular, the present invention relates to a circulating airflow that is performed other than when a cargo is loaded and unloaded, and an air shower device that can effectively perform cleaning by a jet airflow that is performed when these loads are loaded and unloaded.

[0001]

2. Description of the Related Art An air shower device is for preventing dust or the like adhering to a person or luggage from being brought into a clean space such as a clean room. Conventionally, various types of apparatuses have been proposed. For example, Japanese Patent Publication No. 4-504
As disclosed in Japanese Patent Publication No. 95 (hereinafter, also referred to as Document 1), a circulating airflow exiting from the upper part of a shower room and a person or an object (hereinafter referred to as an object) so as to prevent external contaminated air from entering the room. There is known a device provided with a mechanism for generating a jet airflow blown from an inner wall surface of a shower room so as to blow off dust adhering to a purifier (to be comprehensively referred to as a purifier).

FIG. 1 is a cross-sectional side view schematically showing a conventional air shower apparatus disclosed in the above-mentioned publication, in which a part of the apparatus is cut away. In the following description, when a plurality of components having the same function are provided in the apparatus, only some of them may be denoted by reference numerals.

First, a fan (blower) 11 and a filter 13 for generating a circulating air flow A and a fan 15 and a filter 17 for generating a left and right jet air flow B are provided, which are provided independently. Thus, when there is no person to be purified in the shower room 19, only the circulating airflow A flows, and when there is a person to be purified, the circulating airflow A and the jet airflow B are generated.

Here, two air flow paths when a person to be purified is present in the shower room 19 will be described in detail.
First, the circulating airflow A is blown from the ceiling outlet 21 and the jet airflow B is blown into the same room 19 from the side wall outlet 23. These two air flows are introduced into the first duct 27 from a lower outlet 25 provided below the shower room 19. Here, the jet stream B is cleaned by the filter 17 by the fan 15 through the second duct 29,
Further, after the circulating airflow A is guided from the first duct 27 to the third duct 31 by the fan 11, the filter 1
3 and these two air streams are
Will be re-introduced within.

[0005] This air shower device is provided with a fan 11 and a fan 15 so that each fan shares the circulation of two air flows. For this reason, it is characterized in that the jet airflow B can be generated without lowering the air volume of the circulating airflow A. However, there is not much benefit from providing these fans individually, and rather the number of fans used increases,
There are problems that the manufacturing cost is increased, the size of the apparatus is increased, and the power is increased.

[0006] As a technique which can improve such a problem,
In the technique disclosed in Japanese Utility Model Publication No. 3-11649 (hereinafter, also referred to as Document 2), a method is adopted in which the circulation airflow A and the jet airflow B are switched to purify with one common fan. ing.

FIG. 2 shows the configuration of the apparatus disclosed in Reference 2.
FIG. Note that components having the same functions as those of the device configuration shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. In this device, in order to generate a circulating air flow A and a jet air flow B, a common fan 33 capable of switching the blowing capacity in two stages, and a filter 35 for supplying these purified air flows A and B are provided. And are provided.

First, when there is a person to be purified, the blowing capacity of the common fan 33 is operated at a high air volume. At this time, the air flow from the lower outlet 25 is guided to the second duct 39 via the first duct 37. The air flow entering the second duct 39 is cleaned by passing through the filter 35 and reaches the third duct 41. Here, the airflow that has entered the third duct 41 is supplied as a jet airflow B only into the shower room 19 from the side wall outlet 23 by the damper 43 that blocks the flow of the airflow at a high airflow. On the other hand, when there is no person to be purified, the shared
, The damper 43 is opened, and is shut off by designing the nozzle provided as the side wall outlet 23 to a predetermined operating pressure. Therefore, an airflow is generated only from the third duct 41 to the fourth duct 45, and the circulating airflow A is introduced into the shower room 19 from the ceiling outlet 21.

As described above, in this air shower device, the damper is opened and closed by switching the amount of air blown by the fan, and the shower room is cleaned by switching between the circulating air flow and the jet air flow. By such switching, substantially one fan can cope with the circulating airflow and the jet airflow, so that the manufacturing cost can be reduced and the apparatus can be made compact.

[Problems to be solved by the invention]

However, the air shower device disclosed in Document 2 has a configuration in which the airflow in the fourth duct 45 blows directly into the shower room 19 from the ceiling outlet 21. Therefore, in the vicinity of the ceiling outlet 21,
There is a problem that a turbulent flow is likely to occur in the circulating air flow A due to the generation of a high wind speed portion and a low wind speed portion, and it is difficult to generate a laminar flow for efficiently purifying the inside of the shower room 19.

Since there is no filter between the ceiling outlet and the side wall outlet, dust in the shower room 19 flows from the ceiling outlet 21 when the damper 43 is switched or when the apparatus is stopped. It flows back into the fourth duct 45 and flows into the chamber 19 again along the jet airflow B. For this reason, there is also a problem that the cleanliness in the shower room is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and supplies a circulating airflow and a jet airflow with a single fan and is contaminated by a circulating airflow formed as a laminar flow. An object of the present invention is to provide an air shower device that can prevent outside air from entering and maintain high cleanliness.

[0013]

In order to achieve this object, according to the structure of the air shower device according to the present invention,
In the air shower device for generating the circulating airflow blown from the ceiling outlet of the shower room and the jet airflow blowing from the side wall outlet of the shower room, the above-described circulating airflow and the above-described jet airflow are generated. A common fan, a first duct for supplying air flow to the common fan from the lower outlet provided in the shower room, and a second duct provided downstream of the common fan, A first filter for supplying the purified jet airflow to the side wall outlet through the air supply chamber, and a third duct that communicates with the second duct and the damper described above. And a second filter for supplying the purified circulating airflow from the third duct to the ceiling outlet described above. It is set to.

[0014]

Embodiments of the present invention will be described below. The air shower device of the present invention realizes a compact device configuration by connecting one common fan with a first filter for jet airflow and a second filter for circulating airflow, and , These two
The two air streams are independently and reliably generated. In adopting such a device configuration, as the simplest device configuration, one of the two side walls constituting the shower room, that is, substantially perpendicular to the direction in which the person to be purified passes into the shower room. A side wall outlet for blowing a jet airflow is provided on one of a pair of side wall surfaces facing each other in the direction in which the air flow is performed, so that a so-called single-blow type device can be obtained.

Further, as another embodiment of the present invention, a so-called double-blowing type apparatus can be provided in which a side wall outlet is provided on each of the two opposing side wall surfaces. In this case, a compartment is provided at a position facing the above-described air supply room with the shower room interposed therebetween, and a pipe-shaped bypass duct is provided between the compartment and the air supply room. By doing so, pressure equilibrium is formed between the air supply chamber and the compartment, and a jet airflow can be introduced into the shower room from two directions only by providing one shared fan.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 illustrates one embodiment of the present invention.
FIG. 3 is an explanatory diagram similar to FIGS. 1 and 2, and components having the same functions as in the related art are denoted by the same reference numerals.

In the configuration of the apparatus according to this embodiment, the air in the shower room 19 is supplied to the first duct through the lower outlet 25 by a common fan 33 similar to the conventional one, which can be switched between high and low. It is led to the second duct 47 via 37.

First, when the common fan 33 is operated at a high air flow, the airflow that has reached the second duct 47 is purified by the first filter 49 via the air supply chamber 48 and is blown by the side wall. The jet stream B is introduced into the shower room 19 through the outlet 23. During this time, the damper 43
Blocks the airflow to the third duct 51. As disclosed in the above-mentioned document 2, the damper 43 may be suitably arranged such that it opens and closes according to the pressure due to the intensity of the air flow, and that opens and closes by an electric control such as a solenoid valve. I can do it.

When the common fan 33 is operated at a low airflow, the air flow in the second duct 47 is as shown in FIG.
Does not flow out of the nozzle constituting the side wall outlet 23 designed to a predetermined operating pressure similarly to the device described in
The air flow is introduced into the third duct 51 via the opened damper 43. Accordingly, the air is cleaned by the second filter 53 disposed on the ceiling of the shower room 19 separately from the first filter 49, and is circulated into the shower room 19 through the ceiling outlet 21 as the circulating air flow A. be introduced. At this time, the airflow A passes through the filter and flows into the shower room 19, so that the airflow A is formed as a uniform air flow in the plane of the filter, that is, a laminar flow.

Here, as can be understood from the above description and FIG. 3, in the apparatus according to the present embodiment, when blowing the circulating air flow A into the shower room 19, the fourth air flow corresponding to the fourth duct 45 in FIG. The air is introduced from the third outlet 51 through the ceiling outlet 21 through the second filter 53.
Therefore, a good laminar flow is formed when the shower room is cleaned with a low air flow by the common fan. Further, the present apparatus has a structure in which a filter 49 or a filter 53 is provided on the airflow upstream side of the ceiling outlet 21 and the side wall outlet 23, respectively. For this reason, even if the circulating airflow A having a relatively low air volume flows backward for some reason, the cleanliness in the shower room 19 is not impaired.

Although the embodiments of the present invention have been described above, the apparatus of the present invention is not limited to the above-described embodiments. For example, in FIG. 3, as the simplest configuration, the side wall outlet 23 is provided for one common fan 33 for one unit.
Was provided only on one surface of the side wall constituting the shower room,
The case of the single blow type has been described. However, as shown in FIG. 4 similar to FIG. 3, the pair of side walls facing each other are provided with side wall outlets 23a and 23b, respectively, and the air supply chamber 48 and the side wall outlets opposed thereto are provided. Pipe-shaped bypass duct 55 communicating with a compartment 57 provided in the space 23b
Is provided. With such a configuration, the air supply chamber 48 and the compartment 57 are pressure-balanced by the valve function of the nozzle constituting the side wall outlet as described above,
A double-blowing device that can prevent backflow from the shower room 19 can also be used. These arrangement relations and other specific conditions described above can be arbitrarily and suitably designed and modified within the scope of the present invention.

[0022]

As is apparent from the above description, according to the configuration of the air shower device of the present invention, the size of the device can be reduced by forming a circulating airflow and a jet airflow by one common fan. Preferably, these two air streams are supplied via individually provided filters. By adopting such a configuration, the circulating airflow is formed as a good laminar flow, and as described above, even if dust flows backward from the ceiling outlet for some reason, the cleanliness in the shower room is impaired. Nothing. Therefore, by applying the device configuration of the present invention, it is possible to provide an air shower device that is compact and can achieve effective cleaning.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a conventional technique.

FIG. 2 is an explanatory diagram of another conventional technique.

FIG. 3 is an explanatory diagram of an embodiment of the present invention.

FIG. 4 is an explanatory view of another embodiment according to the present invention.

[Explanation of symbols]

11, 15: fan, 13, 17, 35: filter, 19: shower room, 21: ceiling outlet, 23,
23a, 23b: side wall outlet, 25: lower outlet,
27, 37: first duct, 29, 39, 47: second duct, 31, 41, 51: third duct, 33: common fan, 43: damper, 45: fourth duct,
48: air supply chamber, 49: first filter, 5
3: second filter, 55: (by pipe) bypass duct, 57: compartment, A: circulating airflow, B: jet airflow.

Claims (2)

[Claims] 1. An air shower device for generating a circulating airflow blown from a ceiling outlet of a shower room and a jet airflow blowing from a side wall outlet of the shower room, wherein the circulating airflow and the jet airflow are generated. A common duct for supplying an airflow to the common fan from a lower outlet provided in the shower room, and a second duct provided downstream of the common fan. A first filter for supplying the purified jet airflow to the side wall outlet through a supply chamber; a third duct communicating with the second duct via a damper; An air shower device comprising: a second filter for supplying the purified circulating airflow from a duct to the ceiling outlet. . 2. A compartment having a side wall outlet is provided opposite to the air supply chamber, and a bypass duct is provided between the compartment and the air supply chamber. 2. The air shower device according to 1.